I used
rails generate devise:views:bootstrap_templates
to generate bootstrap templates for my app, and though the app is working,
<%= bootstrap_devise_error_messages! %>
in app/views/devise/registrations/new.html.erb is not showing on the app UI when I attempt to sign up (through the generated devise sign up page), i.e. no error message appears if I submit a blank form telling me I cannot have an empty password or some such. However, I do get an error message telling me I need to sign-in to proceed on the users sign-in page. Advice appreciated.